Naphthalen-1,8-diyl 1,3,2,4-dithiadiphosphetane 2,4-disulfide (sometimes noted as NpP2S4) is a compound related to Lawesson's reagent formed by the reaction of 1-bromonaphthalene with P4S10, this is a 1,3,2,4-dithiadiphosphetane 2,4-disulfide which has a naphth-1,8-diyl group holding the two phosphorus atoms together.
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